import router from './router'
import store from './store'
import {Message} from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import {getToken} from '@/utils/auth' // get token from cookie
import {filterAsyncRouter} from '@/utils/menu' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

NProgress.configure({showSpinner: false}) // NProgress Configuration

const whiteList = ['/login'] // no redirect whitelist

var getRouter
router.beforeEach(async (to, from, next) => {
    // start progress bar
    NProgress.start()

    // set notice title
    document.title = getPageTitle(to.meta.title)

    // determine whether the user has logged in
    const hasToken = getToken()
    if (hasToken) {
        if (to.path === '/login') {
            // if is logged in, redirect to the home notice
            next({path: '/'})
            NProgress.done()
        } else {
            const hasGetUserInfo = store.getters.name
            if (hasGetUserInfo) {
                if (!getRouter) {
                    if (!global.antRouter) {
                        await store.dispatch('user/getMenu') // 请求获取路由信息
                        if (store.getters.menu.length < 1) {
                            global.antRouter = []
                            next()
                        }
                        const menus = filterAsyncRouter(store.getters.menu) // 1.过滤路由
                        router.addRoutes(menus) // 2.动态添加路由
                        global.antRouter = menus // 3.将路由数据传递给全局变量，做侧边栏菜单渲染工作
                        next({
                            ...to,
                            replace: true
                        })
                    }
                } else {
                    // getRouter变量存在 说明路由信息存在 直接通过
                    next()
                }
                next()
            } else {
                try {
                    // get user info
                    await store.dispatch('user/getInfo') // 请求获取用户信息
                    await store.dispatch('user/getMenu') // 请求获取路由信息
                    if (store.getters.menu.length < 1) {
                        global.antRouter = []
                        next()
                    }
                    const menus = filterAsyncRouter(store.getters.menu) // 1.过滤路由
                    router.addRoutes(menus) // 2.动态添加路由
                    global.antRouter = menus // 3.将路由数据传递给全局变量，做侧边栏菜单渲染工作
                    next({
                        ...to,
                        replace: true
                    })
                } catch (error) {
                    // remove token and go to login notice to re-login
                    await store.dispatch('user/resetToken')
                    Message.error({message: error || 'Has Error'})
                    next(`/login?redirect=${to.path}`)
                    NProgress.done()
                }
            }
        }
    } else {
        /* has no token*/
        if (whiteList.indexOf(to.path) !== -1) {
            // in the free login whitelist, go directly
            next()
        } else {
            // other pages that do not have permission to access are redirected to the login notice.
            next(`/login?redirect=${to.path}`)
            NProgress.done()
        }
    }
})

router.afterEach(() => {
    // finish progress bar
    NProgress.done()
})
